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The largest known prime tribonacci number is element number 4201 in the sequence, which has 1112 digits. Eric W. Weisstein found this in March 2004, after examining the first 10^4 tribonacci numbers. Note that Dr. Weisstein neglected to point out that 4201 is itself prime. [Post]


  Submitted: 2005-02-25 12:00:11;   Last Modified: 2008-04-23 15:59:41.

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